No More Frames! According to the working draft, the elements frame, frameset, and noframes are not in HTML 5 because “…their usage affected usability and accessibility for the end user in a negative way.”

What About XHTML 2? XHTML 2, as proposed, is an entirely new language that does not have backward compatibility to HTML 4.01, so the upgrade path will be from HTML 4 to HTML 5.